Gestra BK29 is a bimetallic steam trap designed specifically for high-pressure applications. It features a corrosion-resistant Thermovit® regulator and a structural steel valve body, with a nominal pressure rating up to PN160 and a permissible differential pressure of 110 barg. The trap incorporates a check valve, automatic air venting, and water-hammer resistance. It is available with flanged, butt-weld, or socket-weld connections and can be installed in any position. Typical applications include condensate drainage from high-pressure steam mains, distribution branches, and low points, as well as thermal air venting during system start-up and operation.
Gestra BK29 bimetallic steam trap, 3/4-inch angle product image
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BK29 Bimetallic Steam Trap | Gestra
Thermostatic/thermodynamic bimetallic steam trap for condensate discharge on high-pressure steam mains and branch lines, with flanged, butt-weld, or socket-weld connections.
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Specifications
- Steam Trap Type
- Thermostatic/thermodynamic bimetallic steam trap
- Regulator Type
- Thermovit® corrosion-resistant bimetallic regulator
- Nominal Pressure
- PN160
- Nominal Size
- DN15, DN20, DN25
- Connection Type
- DIN flange, socket-weld end, butt-weld end
- Flange Standard
- EN 1092-1 / DIN 2638 PN160
- Butt-Weld End Standard
- DIN EN 12627
- Socket-Weld End Standard
- DIN EN 12760
- Permissible Differential Pressure
- 110 barg
- Pressure-Temperature Ratings for Flanged Ends
- 160 barg at 20°C; 144 barg at 400°C; 134.8 barg at 450°C; 112 barg at 485°C; 104.3 barg at 500°C; 59.4 barg at 530°C
- Pressure-Temperature Ratings for Welded Ends
- 160 barg at 20°C; 138 barg at 400°C; 110 barg at 491°C; 100 barg at 500°C; 57 barg at 530°C; 44.5 barg at 540°C
- Valve Body and Bonnet Material
- Structural steel 1.7335
- Sealing Material
- Graphite/CrNi
- Nozzle, Stem, and Seat Material
- Wear-resistant titanium alloy
- Integrated Strainer
- Provided
- Check Function
- Integrated check valve function
- Automatic Air Venting Function
- Automatic air venting during start-up and operation; suitable for thermal air venting
- Installation
- Can be installed in any position
- Water-Hammer Resistance
- Resistant to water hammer
Application scenarios
Condensate Drainage from High-Pressure Steam Mains and Distribution Branches
Used at high-pressure steam mains, distribution branches, and low-point drainage locations to discharge condensate generated during start-up and operation. The product is rated PN160, has a permissible differential pressure of 110 barg, and provides water-hammer resistance.
Air Venting During Steam System Start-Up and Operation
Installed in steam pipelines or steam equipment requiring air venting to discharge air and non-condensable gases during start-up and operation. The product provides automatic air venting during start-up and operation and is suitable for thermal air venting.
Installation & maintenance notes
Pressure-Temperature Limits for Each Connection Type
Before installation and operation, verify that the pressure and temperature for the selected flanged or welded connection are within the applicable rated ranges. Exceeding these ranges may result in failure of the valve body, seals, or valve function.
FAQ
How does the Gestra BK29 bimetallic steam trap discharge condensate and air during start-up and normal operation?
The BK29 uses a Thermovit® corrosion-resistant bimetallic regulator and a staged nozzle. During start-up, the steam trap is fully open, allowing condensate and air to be discharged. As the temperature rises, the bimetallic element deflects and moves the nozzle toward the closed position, gradually closing the orifice before the condensate approaches the saturated steam temperature. The thermodynamic effect in the nozzle chamber further assists closing. This enables automatic air venting during both start-up and operation, and also allows thermodynamic air venting.
Which parts of high-pressure steam systems are suitable for the BK29?
The BK29 is primarily used for condensate drainage from high-pressure steam mains and steam distribution branches. It is suitable for condensate drainage and air venting during both system start-up and stable operation. Its standard setting supports the discharge of hot condensate with virtually no condensate accumulation and provides resistance to water hammer, making it suitable for high-pressure steam networks where condensate accumulation in mains or branches must be controlled.
How should the BK29 pressure, temperature, and differential pressure be selected according to the connection type?
The BK29 has an allowable differential pressure of 110 barg and a nominal pressure rating of PN160. For the DIN flanged version, the allowable working pressure is 160 barg at 20°C, 144 barg at 400°C, 134.8 barg at 450°C, and 112 barg at 485°C. The maximum listed temperature is 530°C, corresponding to 59.4 barg. For the butt-weld-end or socket-weld-end versions, the allowable working pressure is 160 barg at 20°C, 138 barg at 400°C, and 110 barg at 491°C. The maximum listed temperature is 540°C, corresponding to 44.5 barg. During selection, the actual steam temperature, operating pressure, differential pressure, back pressure, and condensate flow rate must be checked together and matched with the pressure-temperature ratings of the selected end connection.
What connection types and nominal sizes are available for the BK29?
The BK29 is available with three connection types: DIN flanges, butt-weld ends, and socket-weld ends. The nominal sizes are DN15, DN20, and DN25. DIN flanged connections comply with EN 1092-1/DIN 2638 PN160; butt-weld ends comply with DIN EN 12627; and socket-weld ends comply with DIN EN 12760. The weights of the DIN flanged BK29-15, BK29-20, and BK29-25 are 8 kg, 9 kg, and 10 kg, respectively.
How do the BK29 integrated filter, check valve, and unrestricted installation orientation benefit operation and maintenance?
The BK29 is equipped with an integrated filter that intercepts contaminants entering the valve. It also incorporates a check valve function to suppress reverse flow of the medium. The body and cover are made of structural steel 1.7335; the gasket is made of graphite/CrNi; and the nozzle stem and seat are made of wear-resistant titanium alloy. The steam trap can be installed in any orientation, providing installation flexibility for high-pressure steam mains and branches.